大蒜素与丁酸梭菌联用对青脚麻鸡生长性能的影响

丁酸梭菌是一种厌氧肠道益生菌,大蒜素具有良好抑制革兰阴性菌的效果。有机酸配合后者使用可具有良好的促食欲作用,本试验介绍丁酸梭菌与大蒜素分别通过饮水与口粮途径对于麻鸡生长性能影响的应用效果。     

膨化菜籽对青脚麻鸡生产性能及器官的影响

将1020羽50日龄青脚麻鸡随机分为4组,每组3个重复,每重复85羽鸡,各组在基础日粮中添加0、4%、7%和10%的膨化菜籽,试验期为25d。结果表明:添加不同比例的膨化菜籽对青脚麻鸡的生产性能无显著影响;病理组织学的结果显示:添加膨化菜籽比例越大对内脏器官损伤越严重;添加4%的膨化菜籽经济效益最高。     

地面平养和笼养对青脚麻鸡生产性能和屠宰性能的影响

采用1日龄青脚麻鸡公雏1 200只,分成2组,每组6个重复,进行地面平养和笼养的生产性能比较和屠宰性能测定。结果表明:笼养组末重比平养组显著提高4.00%(P<0.05)。在1~10、61~70日龄时,笼养组日均增重分别较平养组有显著提高(P<0.05)。在21~30、41~50日龄,笼养组饲料增重比分别较平养组饲料增重比降低6.64%、5.38%(P<0.05);1~70日龄时,笼养组平均日增重较平养组增加3.88%(P<0.05);平均日采食量、饲料增重比分别比平养组显著低3.57%、7.14%(P<0.05)。两组成活率没有显著性差异(P>0.05)。笼养对青脚麻鸡屠宰率、全净膛率、胸肌率、腿肌率、胫长、胫围没有影响(P>0.05);笼养组半净膛率比平养组半净膛率显著提高3.28%(P<0.05);但同时腹脂率较平养组显著提高40.08%(P<0.05),笼养组胸部囊肿比例比平养组高5.82倍(P<0.01)。     

肉种鸭产蛋周龄与蛋重对种蛋孵化效果的影响

禽蛋孵化率的高低是由种禽年龄、种蛋品质和孵化条件等决定的[1,2]。本试验对肉种鸭在相同孵化条件下,就不同产蛋周龄和不同蛋重对孵化率和健雏率的影响进行了研究,旨在探讨产蛋周     

新型复合抗氧化剂对青脚麻鸡生长性能及抗氧化功能的影响

本试验旨在研究饲粮添加新型复合抗氧化剂对青脚麻鸡生长性能、肉品质及抗氧化功能的影响。选择2 880羽健康、体重接近的1日龄青脚麻鸡,随机分为6组,分别为对照组（基础饲粮）、维生素E组（基础饲粮+100 mg/kg维生素E）、乙氧基喹啉（EQ）组（基础饲粮+250 mg/kg EQ）、 X1组（基础饲粮+150 mg/kg新型复合抗氧化剂）、 X2组（基础饲粮+300 mg/kg新型复合抗氧化剂）、X3组（基础饲粮+450 mg/kg新型复合抗氧化剂）,每组8个重复,每个重复60羽。试验期54 d。结果表明：1）与对照组相比,X1组、X2组、X3组青脚麻鸡1～54日龄的料重比（F/G）显著降低（P<0.05）;与EQ组和对照组相比,X3组青脚麻鸡22～54日龄、1～54日龄的平均日增重（ADG）显著提高（P<0.05）。2）与对照组相比,X1组、X2组、X3组肌肉的亮度值显著降低（P<0.05）;与EQ组和对照组相比,X2组、X3组的肌肉剪切力显著降低（P<0.05）,X2组的肌肉蒸煮损失显著降低（P<0.05）;与维生素E组、EQ组和对照组相比,X3组肌肉...     

蛋重对巨型玫瑰冠鸡种蛋孵化的影响

为探讨蛋重对巨型玫瑰冠鸡种蛋受精率、孵化率以及母雏率的影响,将挑选的900个45~70 g健康种蛋以5 g为一区间分为5组,每组180个(设6个重复,每个重复30个)。结果表明:在相同条件下,巨型玫瑰冠鸡最佳受精率和孵化率的蛋重区间为60.00~64.99 g;蛋重对巨型玫瑰冠鸡母雏率没有显著的影响。     

日粮中添加茶多酚对青脚麻鸡生长性能、胴体品质和血脂的影响

本文研究了在基础日粮中添加0.02%、0.04%和0.06%水平的茶多酚对青脚麻鸡生长性能、胴体品质和血脂的影响。试验选用15日龄健康青脚麻鸡160只,随机分为4个处理组,每组4个重复,每个重复4只鸡。试验期42 d。试验结果表明:在饲粮中添加一定浓度水平的茶多酚能有效提高青脚麻鸡生产性能(P<0.05),但饲料转化率不和日粮中茶多酚添加量成正比;茶多酚对青脚麻鸡胴体品质的影响效果在不同性别间和部位间差异不同,可以有效降低胸、腿肌剪切力,显著提高青脚麻鸡肉的嫩度(P<0.01);随茶多酚添加浓度增加能有效降低青脚麻鸡的腹脂率(P<0.05),同时对青脚麻鸡与脂肪代谢有关的血液生化指标TC、TG、HDL-C、LDL-C和GLU影响在其43日龄左右的生长中期效果显著。要达到显著效果,茶多酚的添加量不少于0.04%为宜。     

糖萜素对广西麻鸡产蛋性能的影响

为了研究糖萜素对广西麻鸡产蛋性能的影响,选取1200只36周龄的广西麻鸡为试验动物进行为期7周的抗饲养试验。试验鸡群随机分为3组,每组两个重复。对照A组饲喂基础饲粮,试验B组和试验C组分别在基础饲粮上添加糖萜素300和500mg/kg,结果表明:B组和C组的产蛋率显著高于A组(P<0.05)、不合格蛋数明显低于A组(P<0.01)。结论:糖萜素具有显著提高广西麻鸡产蛋性能的作用。     

复合微生态制剂对青脚麻鸡生长性能及部分血液生化指标的影响

本文旨在研究日粮中添加微生态制剂对青脚麻鸡生长性能及血液生化指标的影响。试验选取1日龄3 300只青脚麻鸡,按照正交试验设计分成11组,每组3个重复,每个重复100只鸡,试验期56 d。结果表明,第4试验组即添加0.03%枯草芽孢杆菌、0.02%酵母菌和0.015%粪肠球菌的复合制剂能明显提高青脚麻鸡0~3 w平均日增重(P0.05)和降低料肉比(P0.05),显著提高血液中总蛋白和血糖含量(P0.05)。     

不同季节和种鸡日龄对种蛋孵化率的影响

夏季和冬季出雏的二批罗曼种鸡饲养和孵化测定结果表明，不同季节对种蛋的受精率和孵化率有一定的影响；而不同的种鸡日龄对种蛋的受精率和孵化率也有较大的影响；季节和种鸡日龄的双重影响对受精率和孵化率的影响更明显。     

大恒优质肉鸡S01和S05品系的蛋品质测定与分析

本试验选取大恒肉鸡S01和S05品系在相同条件下饲养,300日龄时分别随机抽取新鲜种蛋100枚进行蛋品质测定。测定结果如下:S01品系蛋重为57.1g,蛋形指数为1.39,蛋壳强度为3.6kg/cm2,蛋壳厚度为0.37mm,哈氏单位为78.7;S05品系蛋重为58.6g,蛋形指数为1.34,蛋壳强度为3.7kg/cm2,蛋壳厚度为0.37mm,哈氏单位为82.6。结果表明S05品系的蛋品质优于S01品系,两品系种蛋的各项蛋品质指标均在正常范围内。     

重组鸡IL-2的抗球虫作用

鸡白细胞介素2(Ch IL-2)是一种重要的细胞因子,对Ch IL-2的抗球虫作用做了初步研究,分别在14日龄和21日龄给实验雏鸡胸部肌肉注射不同剂量的重组Ch IL-2蛋白,28日龄口服接种1×105个活球虫卵囊,结果表明,重组Ch IL-2蛋白能降低相对卵囊产量、减少盲肠病变、提高相对增重。其中以注射250μg重组Ch IL-2蛋白的试验组抗球虫效果最好,相对卵囊产量为23.26%,盲肠病变记分分别为0.4,相对增重率为97.80%,综合抗球虫指数(AC I)达到192.8。抗球虫效果良好,明显的优于其他试验组。     

胎次、配种季节对大约克母猪繁殖性能的影响

为研究胎次、配种季节对大约克母猪繁殖性能的影响,运用SPSS 16.0软件对753窝大约克纯种母猪的产仔数、出生窝重和断奶窝重等进行比较分析。结果表明：产总仔数第8胎最高（15.25头）,与第1胎差异显著（P＜0.05）,总的呈现随胎次增加而上升的趋势。大约克母猪春季和冬季配种产总仔数与秋季差异显著（P＜0.05）;冬季配种母猪的出生窝重、断奶均重、断奶窝重均高于其他三季。     

茶叶渣菌酶协同发酵饲料对青脚麻鸡生长性能、屠宰性能及肌肉风味的影响

试验旨在研究饲粮添加不同水平茶叶渣菌酶协同发酵饲料对肉鸡生产性能、屠宰性能和肌肉风味的影响.1080只25日龄青脚麻鸡随机分成5个组,每组6个重复,每重复36只.对照组饲喂基础日粮,试验Ⅰ组在基础日粮基础上添加5％的菌酶协同发酵饲料,试验Ⅱ、Ⅲ、Ⅳ组添加1％、3％、5％的茶叶渣菌酶协同发酵饲料,试验期为28 d.结果 ...     

Effect of a prebiotic on performance of partridge

An experiment was conducted to investigate the effect of a prebiotic on performance of partridge. The experiment was carried out with a total of eighty‐day‐old male Chukar partridge (Alectoris chukar chukar) chicks in a completely randomized design. The dietary treatments consisted of a control and an experimental treatment, and each treatment was replicated four times with 10 chicks per replicate. The experimental period lasted 16 weeks with a starter period (0–8 weeks) and a grower period (9–16 weeks). The control group was fed the basal diet, while the experimental group was fed the basal diet supplemented with 0.18% prebiotic Aspergillus meal in each period. Performance parameters included body weight gain, cumulative feed consumption and cumulative FCR and were recorded at biweekly intervals. Carcass characteristics and blood parameters were measured at the end of the experiment (week 16). Although the results showed that prebiotic had no significant effect on body weight gain and cumulative feed conversion ratio; however, the supplementation of Aspergillus meal significantly (p < 0.05) decreased cumulative feed consumption. Also prebiotic significantly increased percentages of breast and gastrointestinal tract, decreased percentage of back‐neck, decreased blood triglyceride and total cholesterol content and increased blood calcium content. From this study, it was concluded that dietary supplementation of 0.18% Aspergillus meal might offer beneficial effects on partridge feed consumption, carcass quality and blood cholesterol.     

孵化器开启风门时间对孵化率的影响

孵化器开启风门时间对孵化质量的影响试验使用28周龄农大3号父母代种鸡的种蛋共33600枚,放入两台相同的孵化器中各16800枚进行孵化。一台5d正常开启风门,一台10d开启风门,中间测定孵化箱内的CO2浓度。测定延期开风门对受精率、死精率、受精蛋孵化率、入孵蛋孵化率、健雏率、死胎率的影响。试验结果表明,种蛋孵化过程中10d开启风门,受精蛋孵化率和入孵蛋孵化率提高,差异极显著(P<0.01),健雏率上升,差异显著(P<0.05),受精率和早期死胚率无明显差异。     

海兰褐鸡血清淀粉酶同工酶

采用聚丙烯酰胺凝胶电泳法对５５只海兰褐鸡血清淀粉酶同工酶进行研究。结果：①血清淀粉酶有ＡＭＹ１，ＡＭＹ２和ＡＭＹ３三种同工酶；②ＡＭＹ２同工酶存在ＡＭＹ２ＡＡ，ＡＭＹ２ＡＢ和ＡＭＹ２Ｅ８三种表型，其表型频率分别为０．１８，０．３１和０．５１；③各同工酶区带的相对迁移率为：ＡＭＹ１１０．２１％，ＡＭＹ２ＡＡ８．１６％，ＡＭＹ２ＢＢ６．６３％，ＡＭＹ３２．０４％。     

Influence of breed, age and body weight on organ weight in the chicken

Body, liver, heart and spleen weights were measured in 3 different breeds and 2 breed crosses over an age range of 0–8 weeks. Correlation coefficients, linear regression equations, standard deviations of observations around regression lines, and the standard errors of the slopes were calculated to study the effects of age, breed, and body weight on organ weight. The principal findings were:

1. Regardless of breed, organ weight does not change at the same rate as body weight during the first 8 weeks of life.

2. The ratio of liver or heart weight to body weight reaches a peak at about one to two weeks of age and then decreases gradually with age until 8 weeks. Spleen‐body weight ratio, however, increases to about the 3rd week of age after which it remains relatively constant.

3. Significant negative correlations were obtained between body weight and both liver‐ and heart‐body weight ratios; while significant positive correlations were obtained between body weight and spleen‐body weight ratios. The correlation between liver weight and heart weight was found to be higher than that between liver weight and spleen weight or between heart weight and spleen weight.

4. The ratio of organ weight to body weight differed with different breeds. The faster growing breeds had lower ratios of organ weight to body weight and higher correlation coefficients between body weight and organ weight ratios.

5. Regression equations are presented that enable the estimation of organ weights from body weights or from other organ weights in the three different breeds and two breed crosses studied.